Valve-gear



(No Model.)

J.T.-II-IALSEY.

' VALVE GEAR.

Patented Mar. 11, 1884.

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UNITED STATES PATENT Erica.

JAMES T. HALSEY, or RICHMOND, VIRGINIA.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 294,873, dated March11, 1884.

Application filed October 5,1883. (No model.)

the main valve is provided with suitable in-' lets or passagescontrolled by a secondary or cut-off valve, which slides upon said mainvalve, the object of my invention being the provision of improveddevices for imparting motion to the valves.

In the accompanying drawings, which represent a preferred form of aconvenient embodiment of my invention, Figure 1 is a side elevationrepresenting my improvements.

Fig. 2 is a top plan view of the same, and Fig. 3 a transverse sectionalelevational detail.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the eccentricshaft, upon which ismountedthe eccentric B, the connection being rigid and effected in the usualmanner.

O is the eccentric-yoke which encircles the eccentric, and through themedium of which motion isimparted to the valve-stems.

I) is the valve-stem of the cut-off valve, and E the valvestem of themain valve. The valve-stem of the cut-off valve is connected with theeccentric-yoke by means of the pivot F, which is directly attached tosaid yoke. The valve-stem of the main valve is connected with an uprightlug, g, being a part of or connected with a slide, G, which latter ispivotally connected with the eccentric-yoke by means of the pivot H, andis conformed to reciprocate upon a fixed way, I, connected with thebed-frame J of the engine. The connection of the slide with the fixedWay upon which it travels is represented as that of a dovetailed tongueand groove, as is clearly shown in Fig.

ever, be substituted in the stead of the abovenamed tongue and groove.

The valve-stems l) and E are connected With the valves in the usualmanner, a descrip tion of which latter would be redundant in thisspecification.

Such beinga description of a convenient embodiment of my invention, itsoperation takes place upon the actuation of the eccentric by its shaft,occasioning the actuation of the yoke and consequently of thevalve-stems, the valve-stem of the main valve operating through theintermediate instrumentality of the slide, the object of which latter isto guide the motion of said stem and to steady the throw of theeccentric-yoke. The position of the pivot F considered with respect tothe. pivot H is such that a line through the center of the two pivotswould be perpendicular to a line pass ing through the center of theeccentric and a point central between the centers of the pivotsaforesaid.

Incident to the above invention is the advantage that the motion of thecut-off valve is caused to be most rapid when the main valve is at theend of its travel, so that the valves can be opened wide enough to givethe motive fluid a free entrance and can then be closed with a quickmotion as early or late in the stroke as may be found desirable.

Having thus described my invention, I claim and desire to secure byLetters Patent.

1. The combination, in a valve-gear, of the eccentric, eccentric-yoke,valve-stem of the cut-01f valve, valve-stem of the main valve, slide,and way for the-slide, the arrangement and connection of the parts beingsuch substantially as is set forth.

2. The combination, in a valve-gear, of the eccentric-yoke provided witha pivot, F, with the slide G.

In testimony whereof I have hereunto signed my name this 14th day ofJuly, A. D. 1883,

JAMES T. HALSEY. In presence of J. BONSALL TAYLOR, JOHN JoLLEY, Jr.

